81 x 9 = 801. What must you do to make the this equation true?

What is the riddle which can be asked all day with a different correct answer each time.

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

A charming young lady was approached by a kind looking old woman in a restaurant. The old woman said to her, 'You look exactly like my younger daughter. Sadly she passed away a couple of months back. Could you do me a favor and say 'Goodbye, mother' with a kind smile on your face when I leave?

The young lady agreed for the same and said, 'Goodbye, mother' when the old woman left. Soon after, she got the most disengaging shock of her life.

Can you guess what the shock was?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

When it is alive we sing, when it is dead we clap our hands. What is it?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

Why did Buffon take the goal with him after every Juventus match?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?